Hammer



FIG. 1 is an isometric view of a front, top, and left side of an ornamental design for a hammer;

FIG. 2 is a left side elevational view of the hammer of FIG. 1;

FIG. 3 is a right side elevational view of the hammer of FIG. 1;

FIG. 4 is a rear elevational view of the hammer of FIG. 1;

FIG. 5 is a front elevational view of the hammer of FIG. 1;

FIG. 6 is a top plan view of the hammer of FIG. 1; and,

FIG. 7 is a bottom plan view of the hammer of FIG. 1.

The broken lines are for the purpose of illustrating environmental structure and form no part of the claimed design. 

CLAIM The ornamental design for a hammer, as shown and described. 